Trough for silvering glass.



No. 709,336. Patented Sept; I6, 1902.;

c. LA VAL." THOUGH FOR SILVEBING GLASS.

(Application filed May 9, 1902) (No Model.)-

UNITED STAT S PATENT @FFICE.

. CONSTANT LAVAL, OF PITTSBURG, PENNSYLVANIA.

TROUGH FOR S ILVERING GLASS.

SPECIFICATION forming part of Letters Patent N 0. 709,336, datedSeptember 16, 1902.

' Application filed May 9,1902. Serial No. 106,634. (No model.)

To all whom it may concern:

Be it known that I, CONSTANT LAVAL, a citizen of the United States,residingat Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented new and useful Improvements in Troughs forSil v'ering Glass, of which the following is a specificanon. i

This invention relates to certain new and useful improvements in troughsfor silvering glass, and aims to provide a trough of this classby whicha quantity of sheets of glass of any shape or description can be rapidlyand efficiently silvered.

The invention further aims to construct a trough for the purposes aboveset forth which shall be extremely simple in its construction, strong,durable, efficient, and comparatively inexpensive to set up; and to thisend it consists of the novel construction and arrangement hereinaftermore specifically described, illustrated in the accompanying drawings,and pointed out in the claims hereunto appended. I i i In describing theinvention in detail reference is had to the accompanying drawings,formingpart'of thisspecificatiolnwherein like numerals ofreferenceindicate corresponding parts throughout the several views, andin which- Figure 1 is a perspective view of my im-.

proved trough. Fig. 2 is asection on the line 2 2 of Fig. 1. Fig. 3 is alongitudinal sectional view of the trough; and Fig. l is a plan View,broken "away at one end, showing a modified form of discharge end forthe trough.

Referring to the drawings by referencenumera1s,the trough is preferablyconstructed of a single piece of material hollowed out to form sidewalls 1 2, the end wall 3, bottom 4,

and contracted discharge-outlet 5; but, if desired, the trough may beconstructed with separate side and end sections and bottom section,which are secured together in any suitable manner. Each of the sidewalls decreases in height from the closedto the open end of the trough,and each of the said side walls 1 2 has a portion of one end extendingat an inclination toward each other, as at 6 7,

respectively, to form the contracted outlet 5. The trough, if desired,may be closed at both ends, as at 5 5", respectively, Fig. 4:,

efficient manner.

and a suitable opening arranged in the bottom of the trough to form anoutlet, as at 5, Fig. 4.

The bottom of the trough is so shaped as to conform to theinclination ofthe inwardlyextending inclined end of the side walls, or rather thebottom of the trough at the outlet end thereof is formed in a taperingmanner to conform to the shape of the end of the side walls at thecontracted outlet of the trough.

The bottom 4 of the trough extends downwardly at an inclination from theclosed end to the outlet end of the troughthat is to say, the upper faceof the bottom is formed at an incline extending downwardly.

The upper face of the bottom of the trough may extend in a horizontalmanner and the trough pitched atan inclinatiomwhich would perform thesame function as constructing the upper face of the bottom in aninclined manner.

The trough may be constructed of wood, metal, or other suitablematerial, and has the inner face of the side and end walls and the upperface of the bottom provided with a coating 8 of impermeable material,preferably rubber.

It is essential that the trough should be pitched at an inclination'orthe bottomformed at an inclination, so that when using the trough tosilver or coat glass it will cause the coating or silvering solution torun over the surface of the glass which has been placed within thetrough and coat the glass in a very This arrangement is far moreadvantageous than the ordinary way of laying the glass on a fiat tableand pouring the solution over the same, for the reason that if any dirtor dust falls on the plate to be silvered a spot is formed thereon,whereas by using the trough pitched in the manner set forth or formedwith an inclined bottom nothing can remain on the sheet or plate ofglass, as the solution travels from one end of the trough to the otherand carries any foreign substance therewith. The solution is caught atthe end of the trough and used overagain until exhausted. As beforestated, the trough can be provided with an opening at one end fordischarging the solution therefrom.

By the employment of the trough a quantity of plates or sheets of glasscan be coated in a very few moments. This is caused by the rapidity ofthe solution traveling upon the glass and through the trough, owing tothe inclination of the latter.

The coating given to the glass by the employment of the trough is anunusually-brilliant-one, and, furthermore, as before stated, preventsany foreign substance from depositing on the surface, as the flow of thecoating solution easily removes it, and the glass when coated has beenfound to be superior in power of reflection, as no obstruction whateverremains thereon. This also overcomes the using of a chamois-skin orother device for removing a foreign substance from the coated glass, asvery often the glass is scratched or spoiled when cleaning it.

It is thought the many advantages of my improved trough for silveringand coating glass can be readily understood from the fore goingdescription, taken in connection'with.

2-. A trough consisting of a single piece of suitable material hollowedout and having a contracted discharge end, and a lining therefor of animpermeable substance.

3. A trough consisting of a single piece of suitable material hollowedout and having a contracted discharge end, and a lining of rubbertherefor.

4. A device for silvering glass consisting of a trough having acontracted open end, and a lining therefor of an impermeable substance.

5. .A device for silvering glass consisting of a trough having acontracted open end, and a rubber lining therefor.

6. A device for silvering glass consisting of a single piece of materialhollowed out to form atrough with an inclined bottom and a closed and anopen end, and a lining of an impermeable material therefor.

7. A device for silvering glass consisting of a single piece of materialhollowed out to form a trough with an inclined bottom and a closed andan open end, and a lining of rubber therefor.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

CONSTANT LAVAL. Witnesses:

W. O. MORRISON, L. M. SWARTZ.

